ActiveSync cant sync with exchange

Just got this treo700w with windows moible 5 on it and when I go to sync with exchange I get this error:

Synchronization could not be completed. Try again later.
Support code: 80072f17

I have Sync With SSL checked, and on my IIS-Exchange folder use SSL is checked. I have a certificate but it is not signed, so I turned off SSL on exchange folder, turned off use SSL on activesync, and uninstalled the server certificate and still got error messages.

Please help thanks!
Who is Participating?
You would have got a faster response in the Exchange Server TA, we deal with these issues all the time over there.

That error code is certificate related.
Ideally you should be using an SSL certificate, as that provides the most protection when sending across your credentials.
Either a purchased certificate that is supported by the device, or a home grown certificate or purchased certificate with the root certificate installed. (

If you have require SSL enabled on the /exchange , /Microsoft-Server-ActiveSync or /oma virtual directory, then Exchange Active Sync will fail. You need to disable those options.
If you have Forms Based Authentication enabled, then that can cause some problems. I have a work around documented on my web site:

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